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authorTom Spink <tspink@gmail.com>2008-06-05 22:46:12 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2008-06-06 11:29:10 -0700
commit40fb16a360d9c6459afee91dc793c1e3374feb94 (patch)
treebbe5f8a4185ac6784d82ee8c938bb246518f6791 /arch/um/os-Linux/sys-x86_64
parent9f31287b443f30a591539e448fb628e3827a8f61 (diff)
uml: deal with inaccessible address space start
This patch makes os_get_task_size locate the bottom of the address space, as well as the top. This is for systems which put a lower limit on mmap addresses. It works by manually scanning pages from zero onwards until a valid page is found. Because the bottom of the address space may not be zero, it's not sufficient to assume the top of the address space is the size of the address space. The size is the difference between the top address and bottom address. [jdike@addtoit.com: changed the name to reflect that this function is supposed to return the top of the process address space, not its size and changed the return value to reflect that. Also some minor formatting changes] Signed-off-by: Tom Spink <tspink@gmail.com> Signed-off-by: Jeff Dike <jdike@linux.intel.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'arch/um/os-Linux/sys-x86_64')
-rw-r--r--arch/um/os-Linux/sys-x86_64/task_size.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/um/os-Linux/sys-x86_64/task_size.c b/arch/um/os-Linux/sys-x86_64/task_size.c
index fad6f57f8ee..26a0dd1f349 100644
--- a/arch/um/os-Linux/sys-x86_64/task_size.c
+++ b/arch/um/os-Linux/sys-x86_64/task_size.c
@@ -1,4 +1,4 @@
-unsigned long os_get_task_size(unsigned long shift)
+unsigned long os_get_top_address(unsigned long shift)
{
/* The old value of CONFIG_TOP_ADDR */
return 0x7fc0000000;